Cylinder sleeve extracting bar



July 31, 1951 T. E. BROOKS I 2,562,412

CYLINDER SLEEVE EXTRACTING BAR Filed Dec. 4, 1946 INVENTOR.

7770mm" 1? Brooks Patented July 31, 1951 2,5 2,412 CYLINDER SLEEVE EXTRACTING BAR Thomas E. Brooks, Clarinda, Iowa, assignor to Lisle Corporation, Clarinda, Iowa, a corporation of Iowa Application December 4, 1946, Serial No. 713,983

3 Claims.

This invention relates to a sleeve extracting bar for extracting sleeves from engine cylinders.

Certain types of automobiles and trucks employ removable sleeves in the engine cylinders. Such sleeves in time wear out and must be replaced.

The present invention relates to a bar which is particularly adapted for extracting such sleeves.

Such cylinder sleeves are very thin and are subject to distortion by any irregularity on the surface of th cylinder wall. If the sleeve becomes deformed to the slightest extent, the engine will not function properly, and the pistons are apt to bind in the sleeves.

It is an object of the present invention to provide means for extracting such sleeves without impairing the surface of the cylinder walls.

Another objection of the invention is the provi sion of means for beginning the operation of extracting the sleeves. This operation is made difficult by the fact that sleeves fit extremely tight in the cylinders, and the problem of initially bending the sleeves away from the cylinder walls, which must be done without scoring the cylinder walls is a serious problem.

The problem is effectively overcome by the present invention due to the special shape of the extracting bar, which was developed after much calculation and experimentation.

An additional object is the provision of a means for removing the sleeves from engine cylinders quickly.

A still further object is the provision of a sleeve extracting bar having a tapered portion (which is double convex in cross-section) for collapsing cylinder sleeves, whereby there is substantially only point contact between the bar and the sleeve and cylinder wall respectively. Due to this fact, the beginning of the operation of bending the sleeve away from the cylinder wall is facilitated.

Still another object of the invention is the provision of a sleeve extracting bar having a tapered portion, as explained above, for initially bending the sleeve, and which possesses great leverage for collapsingthe whole sleeve after the initial bending has been completed.

A still further object is the provision of a sleeve extracting bar possessing the characteristics hereinbefore mentioned, and which is made of rod stock and finished by a minimum of forming operations.

Another object of the invention is the provision of means for collapsing an engine cylinder sleeve to such a degree that the sleeve can be removed by simply lifting it out of the cylinder.

Still another object of the invention is the provision of a sleeve extracting bar having a sharp terminal edge which is efficient for initially bending the sleeve, and yet possesses sufficient mass for great strength.

With these and other objects in view, my m vention consists in the arrangement and combination of the various elements of my device whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in the claims and illustrated in the accompanying drawings, in which:

Figure 1 is a perspective view of an engine having cylinder sleeves showing the sleeve extracting bar at the point where the sleeve upon which the bar is used is collapsed;

Figure 2 is a perspective view of an engine block showing a collapsed sleeve being lifted out of the cylinder;

Figure 3 is a front view of the sleeve extracting bar;

Figure 4 is a side view of the bar;

Figure 5 is a top View of the bar;

Figure 6 is a view taken on line 6-6 of Figure 3;

Figure 7 is a view taken on line 1-4 of Figure 3;

Figure Bis a view taken on line 88 of Figure 3;

Figure 9 is a fragmentary view showing how th bar is inserted between the sleeve and cylinder wall, with the bar exaggerated in size; and

Figure 10 is a fragmentary view showing the relation between the bar and cylinder wall in the prying operation employed to collapse the sleeve.

Referring now in detail to the drawings, Figure 1 shows an engine block I! having cylinders [4, in which are fitted sleeves 16. The sleeve extracting bar forming th essence of the present invention is indicated at 18, and is shown being handled by the operator in extracting a sleeve,

and at the point where the sleeve'is-collapsed.

Figure 2 shows a sleeve 16 after being collapsed and being withdrawn from the cylinder simply by gripping it with a pair of pliers.

Referring particularly to Figures 3 to 8, inclusive, the sleeve extracting bar i8 consistsofa main shank 20 in the form of a cylindricalrod. At one end, the bar I8 is formed with a reduced portion indicated generally at 22, and this portion may also be referred to as a tapered portion. The reduced portion 22 is formed with a tapered surface 24 on one side of the bar, and is in the form of a section of a cylinder or a surface of revolution of a line about an axis parallel with such line.

The surface 24 is of a radius larger than the radius of the rod 20. This surface 24 extends from a point a few inches from the end of the bar to a point approximately A" from the same end. These dimensions, it will be understood, are strictly examples, and I do not intend to be limited to such precise restrictions. The surface 24 may be referred to as a main length of the tapered, surface, and outwardly of the surface 24 is a terminal length. of lesser extent, indicated at 26. The surfaces 24 and 26 are divided by an arcuate line or ridge 28. The tapered terminal length 26 is formed by cutting the material from the end of the bar on acurved surface, which curves toward the back sideof the bar indicated at 30. It will be noted: by reference flto Figs. 3 and 4, that the surface 26, in addition to being curved between the surface 24 and the back side of the bar, is also curyed in. a'dire'ction transverse thereto forming an outer rounded surface in two directions. The back surface 30 of the bar is given a slight chamfer as indicated at 32, which meets the surface '26 at an acute'angle. This angle therefore presents a sharp edge 34 and by referring to Fig. 3 it will be noted that this sharp edge 34 is curved in an are extending from one side of the bar'to the other. By thisshape, in spite of'h'aving a sharp edge, suificient mass of material is retainedin the terminal end of the tapered portio'n'foi' providing great strength. 5 shows the bar from the top whereby the relative positions of the surfaces and; 26can be observed."'Also, it will be noted from Fig. 5 thatfthe sharp edge 34 is spaced slightly in we rdly from the back side 30 of the bar.

Figures 6, '7 and 8 are sections through the tapered portion 22 of the bar on lines 6-6, 1-1, andiI- -B of Fig.3. The arcs36 in Figs. 6, '7, and 8 indicate the points where the surface is cut anditw'illbe noted that 'the se'arcs 35 are all of the same curvature, since the surface 24 i'sa section of a cylinder. However, in the respective cross-sections the arcs 36 are in different relative positions due to their being spaced at different points outwardly from the back side 30 of the'b ar. r I 3 Figure '7 shows the arc 36 terminating at the extremity of the diameter of the bar. This is the point at which the surface 24 is the widest. The sufface 2'4'varies inwidth in a peculiar shape due'to the angular disposition between the surface of revolution 24 and the bar itself. This point can'also be observed from Fig. 3, wherein at the line 11the outline curve of the surface is as wideas the bar itself.

r The arts 36 'in Figs. 6, '7, and 8 are "slightly elliptical -i'n shape since the lines at which the sections are taken are at asligh't angleirelative to thelinea'rdirection of the surface 24; "To" use the sleeve extracting bar the sharp edge 34 is inserted between the sleeve at its outer edge and the cylindrical wall as shown in Fig. 9. The sharp edge 34 being curved penetrates between the sleeve and wall at substantially a point contact. This forms a wedging action bywhich the edge of the sleeve is parted inwardlyfrom the cylinder wall, and once the edge is parted and the wedge surface 26 penetrates therepast to the line 28, the surface 24 becomes effective for fur ther bending of the sleeve inwardly. The bar is held in the'position with the tapered surfaces '26 and 24 positioned toward the'sleeve and the back side 30 toward the cylindrical wall. To start the bending operation the bar is disposed at an angle to the axis of the cylinder, as shown by dotted lines; with the edge 34 pointing inwardly toward the center of the cylinder. Force is applied, as by means of a hammer to the opposite end of the bar and as the wedging surfaces penetrate between the sleeve and wall, the bar is gradually brought down to a position generally parallel with the axis of the cylinder, as shown by solid lines (Fig. 9) It is thendriven fartherinto the cylinder between the sleeve and the cylinder wall until it reaches the inner end of the sleeve. At this point the outer end of the bar is pried toward the axis of the cylinder, as illustrated by theposition of thebar as shown in Fig. 1. In this prying operation, the slightly chamfered surface 32 is" disposed against the surface of the cylinder wall (see Fig. 10),. When the bar is pried toward the center axis of the cylinder, as illustrated in Fig. 1, the sleeve is collapsed to a point where a considerable portion of the circumferential extent of the sleeve is parted from the cylinder wall. The cylinder therefore ceases to have any binding effect on the sleeve, and the sleeve can be removed merely by gripping it with a pair of pliers and pulling upwardly on it as shown in Figure 2.

'As mentioned hereinbefore, the inner surface of the cylinder wall must be as nearly perfect as possible so that the new sleeve which is driven in under force will not be damaged (as disclosed in my co-pending application, Ser. #679,663,filed June27, 1946, now abandoned). For this reason, 'the tapered surface 32 is provided, which more nearlyconforms to the curvature of the cylinder wall than would be the case if the surface 32 were not provided. The surface 32 is slightly arcuate circumferentially of the bar as indicated in Figure 5. Therefore, if the bar is pried against the cylinder wall the surface 32 is less apt to score or mar the surface of the cylinder wall.

The tapered portion 32 at any point therealong is of double convex formation in cross-section. By reason of this fact there is substantially point contact between the cylinder wall and the sleeve in the initial'bending operation of collapsing the sleeve. This results in greater concentrated force against the sleeve, making it easier to bend and collapse after the bar is inserted well into the cylinder. After the bar is fully inserted into the cylinder, such point contact no longer exists, but the need for it no longer existssince the initial bending operation is completed, and the operator has the advantage of great leverage due to' the length of the bar.

As hereinbefore mentioned, the end of the bar possesses a relatively sharp point while still retaining considerable mass. Another advantage of this fact, resulting from the strength provided, is that the material of which the bar is made need not be of such hard material as would otherwise benecessary, and since the bar material is thereby relatively soft, the likelihood of scoring the cylinder walls is reduced.

While I have shown a particular embodiment of my invention it will be understood of course that I do not wish to be limited thereto, since many modifications may be made, and I therefore contemplate by the claims appended hereto to cover any such modifications or substitutions of equivalents as fall within the true spirit and scope of my invention.

I claim: 7

1; A cylinder sleeve collapsing bar of cylindrical form having a tapered surface at one end and on'one side of the bar, said tapered surfacebeing made up of a main length in the form of a'section of a cylinder, and a substantially lesser terminal length disposed at an angle to said main length, said terminal length being curved linearly and circumferentially of the bar, said terminal length having a sharp terminal edge curved on an arc and having a lateral width greater than half the width of the main portion of the bar.

2. A cylinder sleeve collapsing bar of cylindrical form having a tapered surface at one end and on one side of the bar, said tapered surface being made up of a main length in the form of a section of a cylinder, and a substantially lesser terminal length disposed at an angle to said main length, said terminal length being curved linearly and circumferentially of the bar, the side of the bar opposite said tapered surface having a chamfered portion meeting said terminal length, said chamfered portion being of small dimension, linearly of the bar, relative to said terminal length, said chamfered portion being slightly arcuate circumferentially of the bar, said chamfered portion and terminal length forming a sharp terminal edge, said terminal edge being curved on an arc and having a lateral width greater than half the width of the main portion -of the bar.

3. A cylinder sleeve collapsing bar of cylindrical form having a tapered surface at one end and on one side of the bar, said tapered surface being made up of a main length in the form of a section of a cylinder, and a substantially lesser terminal length disposed at an angle to said main length, said terminal length being curved linearly "REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENT Number Name Date I D. 47,416 Ellis June 8, 1915 506,155 1 Burns Oct. 3, 1893 1,062,464 Haynes May 20, 19 3 1,122,599 Johnson Dec. 29, 1914v 1,276,458 Wagner Aug. 20, 1918 1,286,488 Amberg Dec. 3, 1918 1,340,787 I Morley May 18, 1920 1,385,948 Norlund July 26, 1921 1,611,574 Armbruster Dec. 21, 1926 2,291,795 Colt Aug. 4, 1942 2,411,246 Clapper Nov. 19, 1946 

